BRAKE KIT 0021751 - Caterpillar

Illustration 1 g01419209
Connections of solenoid "A" on valve 2This diagnostic code is associated with solenoid "A" on valve 2. The FMI 03 means that the ECM has determined that the voltage of the solenoid circuit is above normal.The possible causes of the diagnostic code are listed:
The energize circuit of the solenoid is shorted to the +battery circuit.
The valve ECM has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected.Ensure that the diagnostic code of CID 2214 FMI 03 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO THE +BATTERY CIRCUIT.
Turn the key start switch and the disconnect switch to the ON position.
Disconnect the wires from the back of the connector at the valve ECM.
At the machine harness connector for the solenoid, measure the voltage from contact 1 (wire F870-BU) to frame ground. At the machine harness connector for the solenoid, measure the voltage from contact 2 (wire J809-BK) to frame ground. Expected Result:The voltage is 0 VDC.Results:
OK - There are no shorts in the wires. Proceed to Test Step 2.
NOT OK - A voltage is present in the wires. There is a short in the machine harness or in the wires. The short is to a separate voltage source.Repair: Repair the machine harness or replace the machine harness. Ensure that the fix has corrected the problem.STOPTest Step 2. CHECK THE OPERATION OF THE ECM.Turn the disconnect switch and the key start switch to the OFF position. The machine harness connectors for the valve ECM remain disconnected.
Use a removal tool in order to remove the wire that energizes the solenoid from the harness. Remove wire (F870-BU) from contact 6.
Reconnect the machine harness connectors to the valve ECM.
Turn the disconnect switch and the key start switch to the ON position.
Observe the status of the active diagnostic code.Expected Result:The diagnostic code of a FMI 03 changes to a FMI 05.Results:
OK - The FMI 03 changes to a FMI 05. The FMI 05 was activated after the energize circuit for the solenoid was disconnected. The valve ECM has responded correctly to the condition of an open circuit in the solenoid circuit. Reconnect the disconnected wire. Wire (F870-BU) connects to the valve ECM at connector contact 6. Proceed to Test Step 3.
NOT OK - The FMI 03 does not change to a FMI 05. The diagnostic code did not change after the wire for the solenoid was disconnected.Repair: The valve ECM has not responded correctly to the condition of an open circuit in the solenoid circuit. The operation of the valve ECM is not correct. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacing, refer to Troubleshooting, "Electronic Control Module (ECM) - Replace".STOPTest Step 3.